Clean up the SPEC file.

.gitignore

@@ -1 +1,4 @@
 .osc
+_buildconfig-*
+_buildinfo-*.xml
+lua51-bit32-*-build/

lua51-bit32.spec

@@ -1,7 +1,7 @@
 #
 # spec file for package lua51-bit32
 #
-# Copyright (c) 2018 SUSE LINUX GmbH, Nuernberg, Germany.
+# Copyright (c) 2025 SUSE LLC and contributors
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed
@@ -12,7 +12,7 @@
 # license that conforms to the Open Source Definition (Version 1.9)
 # published by the Open Source Initiative.
 
-# Please submit bugfixes or comments via http://bugs.opensuse.org/
+# Please submit bugfixes or comments via https://bugs.opensuse.org/
 #
 
 
@@ -39,16 +39,14 @@ from Lua 5.3; it is compatible with Lua 5.1, 5.2 and 5.3.
 %setup -q -n lua-compat-5.2-bitlib-%{version}
 
 %build
-gcc %{optflags} -I/usr/include -I./c-api \
+gcc %{optflags} -I%{_includedir} -I./c-api \
     $(pkg-config --cflags --libs %{flavor_dec}) \
     lbitlib.c -shared -fPIC -o bit32.so
 
-
 %install
 install -d %{buildroot}%{lua_archdir}
 install -p bit32.so %{buildroot}%{lua_archdir}/
 
-
 %files
 %license LICENSE
 %doc README.md